Cleanup some assertions that were used to signal errors.
Cleanup some assertions that were used to signal errors.

acdha/whisper,penpen/whisper,graphite-project/whisper,kerlandsson/whisper,jjneely/whisper,piotr1212/whisper,akbooer/whisper,cbowman0/whisper,alexandreboisvert/whisper,deniszh/whisper,obfuscurity/whisper,graphite-server/whisper